they say can only fix the screen for me on site. but about the unbalance base problem, they cant ... so thats why they have to bring back.
the person in charged to ask me bout my decision, either to let them bring back and fix the screen together with the check-up on the unbalance base, OR they come and fix my screen only.
then he recommended me to let dell bring back to inspect on the chassis. if really got unbalance issue, they will fix it for me. so its like killing 2 birds with a stone.
so i din think much lo, i told them to come collect next monday. and return on friday.
now i just worried that the technician inside wil be rough to my m11x

i don wan later coem back got full of scratches, or the screws become loosen, or got scratch at keyboard, or any other issue... >.<